21120001003 has 2 divisors, whose sum is σ = 21120001004. Its totient is φ = 21120001002.

The previous prime is 21120000971. The next prime is 21120001031. The reversal of 21120001003 is 30010002112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120001003 - 2⁵ = 21120000971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120001093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560000501 + 10560000502.

It is an arithmetic number, because the mean of its divisors is an integer number (10560000502).

Almost surely, 2^21120001003 is an apocalyptic number.

21120001003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120001003 is an equidigital number, since it uses as much as digits as its factorization.

21120001003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21120001003 its reverse (30010002112), we get a palindrome (51130003115).

The spelling of 21120001003 in words is "twenty-one billion, one hundred twenty million, one thousand, three".